Unicode C
Unicode C
DynamoDB - PutItem
See more Amazon DynamoDB Examples
Creates a new item, or replaces an old item with a new item. If an item that has the same primary key as the new item already exists in the specified table, the new item completely replaces the existing item.Chilkat Unicode C Downloads
#include <C_CkRestW.h>
#include <C_CkAuthAwsW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkStringBuilderW.h>
void ChilkatSample(void)
{
BOOL success;
HCkRestW rest;
HCkAuthAwsW authAws;
BOOL bTls;
int port;
BOOL bAutoReconnect;
HCkJsonObjectW json;
HCkStringBuilderW sbRequestBody;
HCkStringBuilderW sbResponseBody;
int respStatusCode;
HCkJsonObjectW jsonResponse;
success = FALSE;
rest = CkRestW_Create();
// Implements the following CURL command:
// curl -X POST https://dynamodb.us-west-2.amazonaws.com/ \
// -H "Accept-Encoding: identity" \
// -H "Content-Type: application/x-amz-json-1.0" \
// -H "Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=<Headers>, Signature=<Signature>" \
// -H "X-Amz-Date: <Date>" \
// -H "X-Amz-Target: DynamoDB_20120810.PutItem" \
// -d '{
// "TableName": "Thread",
// "Item": {
// "LastPostDateTime": {
// "S": "201303190422"
// },
// "Tags": {
// "SS": ["Update","Multiple Items","HelpMe"]
// },
// "ForumName": {
// "S": "Amazon DynamoDB"
// },
// "Message": {
// "S": "I want to update multiple items in a single call. What is the best way to do that?"
// },
// "Subject": {
// "S": "How do I update multiple items?"
// },
// "LastPostedBy": {
// "S": "fred@example.com"
// }
// },
// "ConditionExpression": "ForumName <> :f and Subject <> :s",
// "ExpressionAttributeValues": {
// ":f": {"S": "Amazon DynamoDB"},
// ":s": {"S": "How do I update multiple items?"}
// }
// }'
// Use the following online tool to generate REST code from a CURL command
// Convert a cURL Command to REST Source Code
authAws = CkAuthAwsW_Create();
CkAuthAwsW_putAccessKey(authAws,L"AWS_ACCESS_KEY");
CkAuthAwsW_putSecretKey(authAws,L"AWS_SECRET_KEY");
// Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
CkAuthAwsW_putRegion(authAws,L"us-west-2");
CkAuthAwsW_putServiceName(authAws,L"dynamodb");
// SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
CkRestW_SetAuthAws(rest,authAws);
// URL: https://dynamodb.us-west-2.amazonaws.com/
bTls = TRUE;
port = 443;
bAutoReconnect = TRUE;
success = CkRestW_Connect(rest,L"dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect);
if (success != TRUE) {
wprintf(L"ConnectFailReason: %d\n",CkRestW_getConnectFailReason(rest));
wprintf(L"%s\n",CkRestW_lastErrorText(rest));
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
return;
}
// Note: The above code does not need to be repeatedly called for each REST request.
// The rest object can be setup once, and then many requests can be sent. Chilkat will automatically
// reconnect within a FullRequest* method as needed. It is only the very first connection that is explicitly
// made via the Connect method.
// Use this online tool to generate code from sample JSON:
// Generate Code to Create JSON
// The following JSON is sent in the request body.
// {
// "TableName": "Thread",
// "Item": {
// "LastPostDateTime": {
// "S": "201303190422"
// },
// "Tags": {
// "SS": [
// "Update",
// "Multiple Items",
// "HelpMe"
// ]
// },
// "ForumName": {
// "S": "Amazon DynamoDB"
// },
// "Message": {
// "S": "I want to update multiple items in a single call. What is the best way to do that?"
// },
// "Subject": {
// "S": "How do I update multiple items?"
// },
// "LastPostedBy": {
// "S": "fred@example.com"
// }
// },
// "ConditionExpression": "ForumName <> :f and Subject <> :s",
// "ExpressionAttributeValues": {
// ":f": {
// "S": "Amazon DynamoDB"
// },
// ":s": {
// "S": "How do I update multiple items?"
// }
// }
// }
json = CkJsonObjectW_Create();
CkJsonObjectW_UpdateString(json,L"TableName",L"Thread");
CkJsonObjectW_UpdateString(json,L"Item.LastPostDateTime.S",L"201303190422");
CkJsonObjectW_UpdateString(json,L"Item.Tags.SS[0]",L"Update");
CkJsonObjectW_UpdateString(json,L"Item.Tags.SS[1]",L"Multiple Items");
CkJsonObjectW_UpdateString(json,L"Item.Tags.SS[2]",L"HelpMe");
CkJsonObjectW_UpdateString(json,L"Item.ForumName.S",L"Amazon DynamoDB");
CkJsonObjectW_UpdateString(json,L"Item.Message.S",L"I want to update multiple items in a single call. What is the best way to do that?");
CkJsonObjectW_UpdateString(json,L"Item.Subject.S",L"How do I update multiple items?");
CkJsonObjectW_UpdateString(json,L"Item.LastPostedBy.S",L"fred@example.com");
CkJsonObjectW_UpdateString(json,L"ConditionExpression",L"ForumName <> :f and Subject <> :s");
CkJsonObjectW_UpdateString(json,L"ExpressionAttributeValues.:f.S",L"Amazon DynamoDB");
CkJsonObjectW_UpdateString(json,L"ExpressionAttributeValues.:s.S",L"How do I update multiple items?");
CkRestW_AddHeader(rest,L"Content-Type",L"application/x-amz-json-1.0");
CkRestW_AddHeader(rest,L"X-Amz-Target",L"DynamoDB_20120810.PutItem");
CkRestW_AddHeader(rest,L"Accept-Encoding",L"identity");
sbRequestBody = CkStringBuilderW_Create();
CkJsonObjectW_EmitSb(json,sbRequestBody);
sbResponseBody = CkStringBuilderW_Create();
success = CkRestW_FullRequestSb(rest,L"POST",L"/",sbRequestBody,sbResponseBody);
if (success != TRUE) {
wprintf(L"%s\n",CkRestW_lastErrorText(rest));
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sbRequestBody);
CkStringBuilderW_Dispose(sbResponseBody);
return;
}
respStatusCode = CkRestW_getResponseStatusCode(rest);
wprintf(L"response status code = %d\n",respStatusCode);
if (respStatusCode >= 400) {
wprintf(L"Response Status Code = %d\n",respStatusCode);
wprintf(L"Response Header:\n");
wprintf(L"%s\n",CkRestW_responseHeader(rest));
wprintf(L"Response Body:\n");
wprintf(L"%s\n",CkStringBuilderW_getAsString(sbResponseBody));
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sbRequestBody);
CkStringBuilderW_Dispose(sbResponseBody);
return;
}
jsonResponse = CkJsonObjectW_Create();
CkJsonObjectW_LoadSb(jsonResponse,sbResponseBody);
CkJsonObjectW_putEmitCompact(jsonResponse,FALSE);
wprintf(L"%s\n",CkJsonObjectW_emit(jsonResponse));
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkJsonObjectW_Dispose(json);
CkStringBuilderW_Dispose(sbRequestBody);
CkStringBuilderW_Dispose(sbResponseBody);
CkJsonObjectW_Dispose(jsonResponse);
}